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1.

Classify the following substances according to their uses :sand, soap, wool, window glass, bamboo, cotton, bricks, silk, leafy vegetables, cement, fruits, water, sugar.

Answer»
  • For construction : Sand, window glass, bamboo, bricks, cement. 
  • As food : Leafy vegetables, fruits, water, sugar. 
  • At home : Soap for cleaning. 
  • For clothes : Wool, cotton, silk. 
Discussion
2.

State whether the following statements are 'true' or 'false'.(1) We can find plastic in nature.(2) Soap is a man-made substance.(3) We should reuse available resources.(4) Nylon clothes are good summer wear.(5) Glass is a man-made substance.(6) In irreversible changes original substances can be obtained again.(7) Rayon is made up of cotton and wood pulp.

Answer»

(1) False

(2) True

(3) True

(4) False

(5) True

(6) False

(7) True
Discussion
3.

How are pearls obtained?

Answer»

1. Pearls are formed when a foreign particle such as a grain of sand or a small particle of rock accidentally enters the space between the mantle and shell of an oyster's body.

2. Oysters cannot reject the particle, and as a defence mechanism its produces a shining coating called nacre on the particle layer by layer.

3. As the shiny layers get added, a pearl is formed.

4. Cultured pearls are artificially formed by inserting a bead in oyster shell and allowed to coat it with nacre over several years.
Discussion
4.

Match the columns :Column 'A'Column 'B'1. Jutea. Animal origin2. Airb. Plant origin3. Leatherc. Man-made4. Cementd. Abiotic

Answer»
Column 'A'Column 'B'
1. Juteb. Plant origin
2. Aird. Abiotic
3. Leathera. Animal origin
4. Cementc. Man-made
Discussion
5.

Fill in the blanks using proper works :(1) Natural rubber is obtained from …………… of trees.(2) Changes where the original constituent substances cannot be obtained again from the new substances are called …………… changes.(3) A paper factory in Maharashtra is situated at …………… .(4) Glass can be made from …………… and …………… .(5) Botanical name of rubber plant is …………… .(6) …………… obtained from mineral oils are used to make polymer chains.(7) The maximum production of rubber in India is in …………… .(8) …………… invented the process of vulcanisation.

Answer»

(1) latex

(2) irreversible

(3) Ballarpur

(4) sand, calcium

(5) Hevea brasiliensis

(6) Hydrocarbons

(7) Kerala

(8) Charles Goodyear
Discussion